Transfer apparatus for drill pipe protectors



4 sheets-sheet 1 IN V EN TOR.

a 2 95 Y V.7 Aw w m; .o 7 A Nov. 9, 1954 Filed June 16, 1949 n illus'.

Nov. 9, 1954 R, R, WOOD TRANSFER APPARATUS FOR DRILL PIPE PROTECTORS 4Sheets-Sheet 2 Filed June 16, 1949 @0m/E91 Q. 0000,

IN1/EN TOR. Br uw WmQ/Eslsh I'Za,

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Nov. 9, 1954 R. R. wooD 2,693,633

TRANSFER APPARATUS FOR DRILL PIPE PROTECTORS 4 Sheets-Sheet 3 'FiledJune 1e, 1949 @00m/5f e. 0000, 5 INVEN TOR.

Nov. 9, 1954 R. R. wooD 2,693,633

TRANSFER APPARATUS FOR DRILL PIPE PROTECTORS Filed June 16, 1949 4Sheets-Sheet 4 ggg.

@00A/EV Q. 0000, INVENToR.

BY n/m TRANSFER APPARATUS FOR DRILL PIPE PROTECTORS Rodney R. Wood,Burbank, Calif., assigner to Byron Jackson Co., Vernon, Calif., acorporation of Delaware Appiication June 16, 1949, Serial No. 99,504

6 Claims. (Cl. 29-236) This invention relates to improvements inapparatus for installing protector collars on drill pipe and the like,and is particularly directed to improved apparatus for sliding resilientprotector collars olf of nonresilient transfer sleeves, In the art ofrotary well drilling it has become common practice to providerubber-like protector collars at intervals on the drill pipe in order toreduce wear on the drill pipe and the connection fittings known as toolpoints and couplings. The protector collars are usually composed ofnatural or synthetic rubber or rubber compound and are spaced atintervals along the pipe to reduce wear on the drill pipe tool jointsand on the casing.

These protector collars ordinarily comprise annular rings which encirclethe pipe to be protected. In order that they may tightly grip the pipeand thereby prevent slippage, the protector collars are initially formedwith their internal diameters smaller than the external diameter of thepipe. Accordingly, it is required that the protector collars be expandedto permit their being slipped over the pipe.

lt has become common practice in the art to first expand the protectorcollar and slip it onto a cylindrical steel sleeve having an insidediameter slightly larger than the outside diameter of the drill pipe andtool joints and then to transfer the protector collar directly from suchcylindrical sleeve onto the drill pipe. Cylindrical sleeve transfermeans of this type are commonly known as transfer sleeves. The mechanismfor transferring the protector collar from such transfer sleeves to thedrill pipe is the subject matter of the present invention.

Several devices have heretofore been used for this purpose comprising,among others, mechanical screwjack means adapted to push the protectorfrom the transfer sleeve onto the drill pipe by the abutment of pressurerings and the like, and fluid actuated abutment means constructedintegrally with the transfer sleeve. The difficulty with these andsimilar expedients is that such means ordinarily constitute heavy,unwieldy articles. Frequently a drill string composed of many sectionsof drill pipe must be fitted with protector collars adjacent the .endsof each section. This entails a lifting of each protectorbearingtransfer sleeve, a placing of same over the drill pipe, a transfer ofthe protector to the drill pipe, and a removal of the transfer sleevefrom the drill pipe. Therefore, manipulation of any excessive Weight inaddition to the weight of the transfer sleeve alone causes considerableloss of time in applying the protector to the drill pipe, involvesincreased labor expense, and is likely to result in accidents. Inaddition, transfer apparatus prior to the present invention, such as themeans outlined above, generally have not been suitable for use with thedifferent sized transfer sleeves necessitated by different sized drillpipe, being rather limited to a single size transfer sleeve.

In the copending application of Albert L. Stone, Serial No. 275,136,filed March 6,' 1952, now Patent No. 2,674,034, dated April 6, 1954 (acontinuation of Stone application Serial No. 59,567, filed November 12,1948), there is shown an apparatus for transferring protector collarsfrom a transfer sleeve to a drill pipe which avoids the limitationsmentioned above and provides a satisfactory device for this purpose.This apparatus comprises, briefly, a body section having asleeve-engaging arm adapted to rigidly anchor such section to acircumited States Patent 2,693,633 Patented Nov. 9, 1954 ice ferentialflange formed on one end of the transfer sleeve, this body sectionincluding a piston; and a cylinder section slidable on the body sectionhaving a protectorengaging arm adapted to engage the lip of theprotector collar. Upon the introduction of fluid pressure between thepiston and cylinder, the cylinder is urged away from the piston tothereby cause the protector-engaging arm to force the protector axiallyfrom the end of the transfer sleeve. This apparatus is capable ofsatisfactorily transferring protectors from a transfer sleeve onto adrill pipe, being light in weight, easy to handle, and positive in itsoperation. In addition, the apparatus is operable with different sizedtransfer sleeves so that it is unnecessary to provide another sizeapparatus to accommodate a changed size of transfer sleeve applicable toa changed size of drill pipe.

However, in the apparatus disclosed in the aforementioned copendingapplication, the body section is securely affixed to the transfer sleeveagainst axial movement relative thereto in either direction, and hencethe operator is subjected to the substantial reaction force or kickgiven the sleeve by the resilient protector collar in its nal stage ofleaving the transfer sleeve. This kick occurs shortly after the majorportion of the protector collar has been forced onto the drill pipe andis caused by the release of stresses within the expanded protectorcollar. This internal stress in the intermediate fiared portion of theprotector collar between the portion on the pipe and the portionremaining on the transfer sleeve produces a force having a rearwardlyacting component which tends to expel the transfer sleeve outwardly andaway from the protector collar. This force is opposed by the frictionbetween the protector collar and the transfer sleeve, which friction isobviously progressively reduced as the protector is forced olf thesleeve. At some intermediate point in the operation this force becomesgreater than the opposing friction force, and thereafter the ratio ofthis force to the friction force increases rapidly, resulting in a rapidacceleration of the relative movement between the protector collar andthe sleeve. Inasmuch as at that time the major portion of the protectorcollar is in tight gripping engagement with the heavy drill pipe and istherefore held stationary, the reaction force subjects the relativelylight transfer sleeve to a powerful rearward kickf If the transferapparatus is securely affixed to the transfer sleeve it also issubjected to the same kickf It will be readily observed that, should theoperator continue to grip the device, he will be subjected to the shockof this sharp kick. However, if he releases his grip on the apparatus,both the transfer sleeve and the attached transfer device will beimpelled from the protector collar; repetition of this movementis'likely to result in serious damage to the device, Accordingly, it hasbeen found desirable to provide some means for attaching the protectortransfer device to the transfer sleeve which, while providing a rigid,positive connection therebetween during the transfer operation, wouldallow said device to bef readily disengaged from the transfer sleeve atsuch time as the protector collar is finally snapped off the sleeve ontothe drill pipe. The present invention provides a protector collartransfer device incorporating such attachment means. lt also providessuch a device which is simpler and less expensive to construct than thatshown in the aforementioned Patent No. 2,674,034. In addition, the useof the protector transfer device of my present invention also permitsthe utilization of a simpler and less expensive transfer sleeve thanthat required It is another object of this invention to provideprotector transfer apparatus which permits the use` of transfer sleevesof simpler and less expensive construction than heretofore.

. Further objects and advantages of the' invention will appearhereinafter.

Inl the drawings:

Figure 1 shows a side elevational` view of a protector transferapparatus incorporating the present invention affixed to a transfersleeve and in position to-exert pressure on a` protector collar totransfer theV same from the transfer sleeve onto the drill pipe.

Figure 2 shows a fragmentary view of the apparatus midway in theprotector-transferring operation.

Figure 3" shows an enlarged longitudinal sectional viewof the apparatusshown in the position assumed in Figure 1, with the upper portionthereof taken on line 3 3- ofFigure 4.

` Figure 4 shows a view partly in topplan and partly in transversesection on line 4-4 of Figure 3.

Figure 5 shows a cross-sectional view of the apparatus taken on line5--5-of Figure 3.

Figure 6 shows a side elevation of a modification of the protectorcollar transfer apparatus which incorpo'- rates the transfer sleeveattachment means of the present invention.

Figure 7 shows a longitudinal sectional view of a modification embodyinga mechanically actuated protector collar transfer apparatus.

Figure 8 shows a top plan view of the apparatus shown in Figurev 7.

Figure 9v shows a fragmentary longitudinal sectional View of anotheralternative embodiment of the invention.

Figure 10 shows a fragmentary top plan view of the alternativeembodiment of Figure 9.

Figure 1l shows a fragmentary longitudinal sectional view of anotheralternative embodiment ofv the invention.

Figure 12 shows a fragmentary top plan view of' the alternativeembodiment of Figure 11.

`Referring' tothe drawings, the general assembly of the apparatusconsists of aY pump 10 which may be operated by a foot pedal 11 todeliver fluid through a conduit 12 to a head 13- to force downwardly acylinder 14 mounted slidably on a stationary plunger 15; if desired, amotor driven pump (not shown) may be substituted for the foot operatedpump as a uid pressure source. Referring to Figures 3 and4, integralwith the head 13- is a sleeve-engaging arm 16; The arm 1.6'carries twopins 17 adapted tobe inserted into-holes 1S" formed in theV side wallofthe transfer sleeve 19. Carried by the cylinder 14V is aprotector-engaging arm 2.0 adapted, as shown in Figure 2, to force theprotector collar 21 from the transfer sleeve 19Y onto the drill pipe 22upon the application of fluid pressure More particularly, the stationaryplunger 175 may be threadedly secured to the head 13. The plunger 15 ishollow and openl at both ends and forms a continuous passagecommunicating with. the bore. 23V in the head- 1-3. Slidable on theplunger and splinedthereto by meansV of a key- 24.and key-way 25 isthecylinder- 14; TheY lower end of' plunger 15 issealed to the inner wallof the cylinder 14'V by sealing means such asthe O'ring 26:. A- cylinderhead or plug 2.7 closes the lower endof cylinder' 14 and is held inplace by a snap ring 28 andl sealed by a similar O-ring 29. A plug 30'is threadably received in a bore 31. centrally formed in the cylinderhead 27; this plug may be removed topermit bleeding of entrapped airfrom the cylinder when desired. l

The pins17 are rigidly secured in sockets formed 1n thefend wallof. thearm 16. and adapted to be inserted into the holes 18 formed in thetransfer sleeve 19. It will be noted that these pins project inadirection inclined toward they axis of the transfer sleeve and away fromthe protector-engaging arm 20. It will also be noted that the holes 18in the sleeve are formed at a corresponding angle. The purpose of thesepins and holes is to prevent relative movement between plunger I5 andtransfer sleeve 19 upon the introduction of fluid pressure into bore 23.

Adjustably aixedto cylinder 14y is the protector-engagingv arm said armincluding a hub portion 32 bored to receive the cylinder. The hubportion is split at 33 and provided with a clamping bolt 34. Theprotector-engaging arm. 20 has a lip 35 adapted to-be inserted under theupper edge of protector collar 21 and thus assure positive coactionbetween the protector collar and arm 20. As shown in Figure 5, arm 20 isalso provided with a pair of spring-urged plungers 36 mounted in thebores 37 to abut against the side of the transfer sleeve 19, maintainingthe axis of'cylinder 14 and-plunger 15 parallel with that of thetransfer sleeve 19. These plungers 36 provide a secondaryprotector-engaging means to accommodate different sized transfersleeves, said plungers being adapted toengage portions of the resilientprotector collar 21 which might otherwise, in the use of outsizedtransfer sleeves, wedge between the sleeve 19Y and arm 20 and bind theapparatus. It is to be noted that the outward movement of the plungers36 is limited by the stop pins 38 engageable in slots 39 in the saidplungers.

In the'operation of transferringv a protector collar 21 from a transfersleeve 19 ontoy av pipef 22, the transfer sleeve encircled by aprotector' collar is ordinarily first placed about the pipe, preferablyadjacent a tool joint (not shown). The transfer apparatus is thenbrought up` to the transfer sleeve' 19y and the pins 17 inserted intothe holes 18 formedA in the side wall of the sleeve 19. In this positionof the apparatus, the'protector-engaging arm 20"abuts the side of thetransfer sleeve 19, and the plungers 36 assist in aligning theapparatus. Since there are ordinarily aV number of protectonbearingtransfer sleeves from which the protector collars must be transferredonto the drill pipe, it will be understood that the herein-describedoperation constitutes al continuous cycle, and ordinarily it will befound that each group of protector-bearing. transfer sleeves will havetheir protector collars mounted in approximately the same place withrespect to the holes 18 formed inthe transfer sleeve. Occasionally,however, as with theV introduction of a new group of protector-bearingltransfer sleeves, it will be found that the protector collars are infdifferent relative positions, and since it is desirable that before theapplication of uid pressure the lip 35 of thevr protectorengaging' arm20 be closely adjacent or touching the protector collar 21., the bolt34' may be loosened to slide the arm on the cylinder 14` to its properposition, asv shown in Figures l and 3, preparatory to the applicationof fluid pressure.

Proper positioning of the apparatus having been accomplished, theoperator presses upon foot pedal 11 admitting fluid. pressure into thebore 2.3V and hollow plunger 15. The fluid pressure forces the cylinder1'4 downwardly with respect tothe plunger 15. Since the cylinder 1,4carries the arm 20, the arml forces the protector collar 21 downwardly.along the transfer sleeve 19 until the elasticity of the protectormaterial snaps the. lower end of the protector collar 21 over the lowerend of. the transfer sleeve 19v and ontofthe` drill pipe 22. It.shouldbe, observed that asrlip 35 of arm'20 initially pressurallycontacts theupper edge of the protector, the plunger 15 and hencesleeve-engaging arm- 16 are urged upwardly withv respect tothe transfersleeve 19, as viewed in. Figure.. 3f. At this` point, and during thesubsequentmovement. of the cylinder 14-.upon the plunger 15, due to theinclined mounting off pins 17 on arm 16, this upward reaction iseffective to` maintain arm; 16u and consequently thev plunger 15 rigidlyattached to the transfer sleeve. 19. Arm. Z0,n continues to force theprotector collar downwardly until the major portion thereof isdisposeduponv theY drill pipe (as shown in Figure 2)- At. this point theupwardforce resulting. from the internal stresses in the protectorcollar overcomes friction between the protector collar and the transfersleeve and forcesthe transfer sleeve upwardly and away'from theprotector collar. The net or resultant force. effec.- tive to expel thetransfer sleeve from within the protector increases rapidly as thefrictional area between the protector and the. sleeve is reduced, and`attains suchl final magnitude that the transfer sleeve is expelledviolently at high speed. In. the embodiment of the. invention shown inFiguresl 3 and 4, the engagement of the pins 17 with the. holes 18 inthe sleeve tends. to cause the transfer apparatus to be expelledupwardly with the sleeve. However, the operators grasp on the transferapparatus exerts a restraining force thereonat4 a point offset laterallyfrom the line of application of force by the' sleeve on the transferapparatus, thus producing a moment in a clockwise direction as viewed inFigure 3. This moment, acting about the tip of the lip 35 as a center orfulcrurn, causes the pins 17 to be withdrawn from the holes 18, thusdetaching the transfer apparatus from the sleeve. The upward and inwardinclination of the pins 17 also produces a camrn-ing action whichassists in the retraction of the pins.

Although in the accompanying drawings the transfer apparatus is shown ina position to force the protector collar downwardly over the lower endof the transfer sleeve, it should be noted that operators frequentlyprefer to mount the apparatus on the drill pipe in an inverted positionand thus force the protector collar upwardly onto the drill pipe. It isalso customary to apply the protectors to the pipe in a horizontalposition, such as on the pipe rack, by forcing the protector off the endof the sleeve remote from the adjacent tool joint. In each of theseinstances there is a possibility of damage to the transfer apparatusshown in the aforementioned Patent No. 2,674,034 resulting from thehook-shaped sleeve clamp striking the upper shoulder on the drill pipetool joint. By the provision of a releasable connection such as isprovided by the pins 17 of the instant apparatus, the danger of damageto the transfer apparatus from this source is entirely eliminatedinasmuch as the transfer apparatus is not in this case subjected to theexpelling force exerted on the transfer sleeve by the protector.

It will be noted that the transfer apparatus just described is similarin many respects to the apparatus described in the aforementioned PatentNo. 2,674,034, the principal difference therebetween being the meansVutilized to connect the transfer power means to the transfer sleeve.The provision of the readily disengageable connecting means between thepower-operated transfer device and the transfer sleeve shown in thepresent application not only increases the ease and safety of theprotector transfer operation, but, in addition, the provision of suchmeans substantially decreases the cost of manufacturing both theprotector transfer device and the transfer sleeve. With respect rst tothe protector transfer device:it will be seen that the relativelycomplex clamp and plunger assembly required by the device shown in thecopending application is eliminated in favor of the two pins 17. As tothe transfer sleeve, it will be noted that it is necessary when using aprotector transfer device e equipped with the aforementioned clamp andplunger assembly to provide for use therewith a transfer sleeve havingan arcuate internal ange machined on one of its ends; however, it isonly necessary to provide two pinreceiving holes in the side wall of thetransfer sleeve used with a protector transfer device equipped with theconnecting means shown in the principal embodiment of the presentinvention. It should also be observed that a single pin of largercross-section could be utilized in this embodiment in place of the twopins 17.

Figure 6 shows a modified form of the protector transfer device in whichthe sleeve-engaging arm 16a and the protector-engaging arm a arereversed in position with respect to the transfer sleeve 19a.Accordingly, in this modification, the sleeve-engaging arm 16a is formedintegrally with split hub 32a, which hub is adjustably clamped tocylinder 14a by bolt 34a, and the protectorengaging arm 20a is formedintegrally with the head 13a. Although sleeve-engaging arm 16a isidentical in construction to arm 16 of the device shown in Figures 1through 5 and includes the inclined pins 17a, the protector-engaging arm20a is of unitary construction and does not incorporate counterparts ofthe spring-urged plungers 36. To remove the protector collar 21a fromthe transfer sleeve 19a, the device is positioned upon the sleeve asshown in Figure 6, and fluid pressure admitted to the device throughconduit 12a so that the hollow plunger is urged downwardly with respectto the cylinder. Consequently, head 13a and protector-engaging arm 29aare also urged downwardly to force the protector collar 21a off thesleeve 19a and onto the drill pipe. The manner in which this form of theinvention is released from the transfer sleeve during expulsion of thesleeve from the protector is obviously the same as with the embodimentof Figures 3 and 4.

Figures 7 and 8 show a manually actuated protector transfer deviceincorporating the readily disengageable transfer sleeve attachment meansof the present invention. This device comprises a body member 50 toreceive a nut member 51, the threads of which engage an externallythreaded jackscrew 52. This jackscrew supports at its lower end aprotector-engaging arm 53. The jackscrew 52 may be turned within nutmember 51 by means of a suitable wrench 54, which wrench engages a shorthub 55 of square cross-section formed at the upper end of the jackscrew.The wrench may be provided with a ratchet head 66. Integral with bodymember 50 is a sleeve-engaging arm 56 which carries inclined pins 57within sockets formed in its outer end. These pins are mounted in arm 56in the identical manner that pins 17 are mounted in the arm 16 of theinitially `described embodiment of the invention, and are adapted to beinserted into holes 58 formed in transfer sleeve 19h. Nut member 51 isrestrained against axial movement within body member S1 by a flange 59and a retaining ring 60, and against relative rotation therewith by asetscrew 61. A gripping handle 62 which is threadedly secured to theouter end of body member 50 facilitates the operation of the device.Protector-engaging arm 53 is bored to receive a bearing 63 journaledupon the jackscrew 52 and a retaining ring 64 on the jackscrew 52prevents axial displacement of the bearing. Arm 53 includes a lip 65adapted to abut transfer sleeve 19h and engage the upper edge of aprotector collar 2lb. lt will be seen that turning of jackscrew 52within nut member 51 will effect axial movement of the jacltscrew andarm 53 with respect to the transfer sleeve 19h. Thus, in order to forcea protector collar 2lb off the lower end of the transfer sleeve 19b ontoa drill pipe, the device is first positioned on the sleeve with itselements arranged as shown in Figures 7 and 8. Next, wrench 54- isturned to cause downward movement of jackscrew 52 and arm 53, until suchtime as the major portion of the protector collar 2lb has been forceddownwardly over the lower end of the transfer sleeve onto the drillpipe. At this time the transfer sleeve will be sharply impelled upwardlyaway from the protector collar and the transfer device will be detachedfrom the sleeve, all as described above. it is preferable that thewrench 54 be of the ratchet type in order that the handle thereof maycontinually be maintained in such a position that the operators handswill not be endangered by virtue of being located between the edge ofthe transfer sleeve and the wrench handle when the sleeve is upwardlyimpelled.

Referring now to Figures 9 and l0, an alternative attachment means isshown for disengageably connecting the aforedescribed protector transferdevices to a transfer sleeve. ln this embodiment of the invention, theprotector transfer device is provided with a sleeve-engaging arm 16Chaving an upwardly liared outer end portion defining an inclinedabutment surface '70. The flared outer endportion of arm 16e is adaptedfor insertion into a recess 71 formed in an anchor block '72, whichblock is integrally aliixed, preferably by welding, to one end of theprotectorbearing transfer sleeve 19e. When the sleeve-engaging arm 16Cis thus positioned, the abutment surface 70 thereof will fit within thecomplementary, axially and transversely opposed abutment surface 73,which latter surface is defined by the closed upper end of the recess71. Upward movement of the protector transfer device with respect to thetransfer sleeve 19C will be prevented by the abutment of the two axiallyand transversely opposed surfaces and 73. Further, because of theinclination of these surfaces with respect to the transfer sleeve. suchmovement will be effective to urge the outer end of the sleeve-engagingarm 16e transversely into firm contact with the transfer sleeve 19C.Circumferential movement of retaining arm 14a is prevented by theparallel ribs 74 forming lower extensions of anchor block 72 anddefining the sides of recess 71. When, however, the major portion of theprotector collar has'been transferred onto the drill pipe and thetransfer sleeve is suddenly forced upwardly away from the protectorcollar, the protector transfer device is instantly disengageable fromanchor block 72, inasmuch as the inner end of the sleeveengaging arm 16Cis free to slide out of the recess 71 upon such upward axial movement ofthe sleeve.

Referring now to Figures 1l and l2, a second alternative attachmentmeans is shown for disengageably connecting the protector transferdevice to a transfer sleeve. ln this embodiment a pair of upwardlyextending pins are rigidly secured in sockets 81 formed in the outer endportion of the sleeve-engaging arm 16d. These pins 80 are adapted to beinserted into axially extending bores S2 formed in an anchor block 83integrally aixed, pref- @amaca-s ierably'byfweldng, to one end of thetransfer'sleeve 19d; -Whenvthe pins 80 are thus positioned, upward axialmove- :ment-of .the protector transfer device with vrespect to theYtransfer :sleeve will be restrained during the transfer operation, byreason of the engagement of the end portion .ofthe upper surface 84 ofarm 16d with the lower surface 85 of theanchor block 83. Transverse andcircumferential Vmovement will be prevented by the engagement of fthepins 80. with the bores 82. At such time as the protector collar snapsonto the drill pipe and the transfer sleeve 19d :is suddenly forcedupwardly away Vfrom the protector collar, the transfer device Yisinstantly disengage- 'able from anchor block S3 yas pins 80 withdrawfrom 'bores 82.

Having fully described my invention, it is to be understood that I donot wish to be limited to the details herein -set forth, but myinvention is of the full scope of the appended claims.

l. Portable apparatus for forcing an elastic drill pipe protectoraxially onto a pipe from an encompassing vtransfer sleeve -having atransverse hole therein extending inwardly from the outer Wall thereofand providing an abutment surface adjacent said outer wall, saidapparatus comprising: extensible force applying means having relativelyrectilinearly movable members, anchor means carried by one of saidmembers, pusher means carried by 4the other of said members, said anchormeans and pusher /means extending in the same direction laterally of thedirection of relative movement of said members, said anchor meanscomprising a pin projecting laterally from said one member and being ofa size to t loosely in said -hole and engage said abutment surfacethereby providing ready removal of said pin from said hole bysubstantially `radially outward movement thereof with respect to the,axis of said sleeve upon release of pressure between said pin and saidabutment surface, said pusher means having :a relatively small surfaceadjacent the outer end thereof engageable with an end portion of saidprotector, said 'anchor and pusher means being substantially inalignment in the direction of relative movement of said members wherebysaid apparatus 'may be engaged with vor 'disengaged from said sleeve andprotector from one side and entirely within a narrow sector thereof.

2. Apparatus as set forth in claim l, wherein said pin is inclined `in adirection extending toward the axis of 'said sleeve and away from saidpusher member and said protector.

'3. Apparatus as set forth in claim l, wherein said relativelyrectilinearly movable members comprise cooperat- -inguid-actuated pistonand cylinder members.

4. Portable apparatus 'for'fdrcing an felastic drill lpipe 'protectoraxially onto a pipe :from an Yencompassing 'transfer sleeve having :apair .of transverse 'holes :therein extending inwardly from the outer.wall thereof `and providing abutment surfaces adjacent said outer wall,said apparatus comprising: Vextensible dforce applying .means havingrelatively rectilinearly movable members, anchor means carried by one ofsaid members, `pusher :means vcarried by the other of said members, saidanchor :means 'and pusher means extending 1n the same directionlaterally'of the direction of relative movement of said members,

said anchor means comprising a pair of :pins projecting laterally fromsaid one member and being of a size to't loosely in said holes andengage said abutment surfaces thereby providing ready removal of saidpins from said vholes by substantially radially outward movement thereofwith respect to the axis of said sleeve upon release .of pressurebetween said pins and vsaid abutment surfaces, said pusher means havinga'relatively small surface adjacent the outer end thereof engageablewith an end portion of said protector, said anchor and pusher 'meansvvbeing substantially in alignment in the direction of relative movementof said members whereby said apparatus may be engaged with or disengagedfrom said sleeve vand protector from one side and entirely `within aVnarrowsector thereof.

5. Apparatus'as set forth in claim 4, wherein said pins -are inclined ina direction extending toward the axis of said sleeve and away from saidpusher member and said protector. l

6. Apparatus as set forth 1n claim 4, wherein said relativelyrectilinearly ymovable members comprise cooperating fluid-actuatedpiston and cylinder members.

References Cited in the file of this patent j UNITED STATES PATENTS

